The best article in the world is one written in the niche you are an expert in. Write about what you are very experience in because the content idea's will come naturally and you'll be able to cover that one topic in depth making it an epic one.

"you have to be on trend"...given this premise there will never be any new trends will there? If everybody only writes about whats in trend then basically you are being ruled by fickle social ebbs and flows.

So how exactly do you stay on trend with a UNIQUE voice. One minute you advise a sheep type mentality, followed up by an opposing statement.

Buzzsumo is, at best, a keyword collection service, like 'mention' and all the rest.

First of all, understand who your target audience is. Are you looking at teenagers, professionals, business people, retired people? Are you looking at men, women, kids or all of them? Think about what topics are they likely to be interested in. Research these topics through Google, on social media etc. See what interesting content other people have made on these topics. When you've done all this, you should have a fairly good idea of what your audience wants & you can get down to actual making of the content.